The Lady of Pain has seen you! And now all portals of the City of Doors have been forced shut. Planar commerce has stopped! And you have family out there walking the planes right now! Can you rescue your kin when the Power of the nexus city has barred all travel? And why oh why can't you fall asleep without waking in cries of pain?
The Infinity Wheel is a complex multiverse that contains all of existence in Dungeons and Dragons. It is best conceived as viewing the planes of existence in three categories. The Prime Material Plane, The Inner Planes, and the Outer Planes. Start by looking at the Introduction section of the Handbook below.